How much weight can a floating vessel carry before submerging?  before it submerges? Assumptions: * The water is not disturbed (no waves or wind) and the cargo does not move * The vessel weighs 200 lbs when empty * The vessel's volume is 60 cubic ft

If the weight of an object is less than the weight of an amount of water of the same volume, it will float. The weight of water per cubic foot is about $62.5$ pounds. $60$ of these weigh about $3745$ pounds. The weight of the boat is $200$ lbs. That leaves an extra $3545$ pounds for water. That takes up about $56$ cubic feet.